Question

Minimum frequenty required to remove electron from Cs metal is 4.6 x 10^14 Hz then what will be minimum energy of Photon use to remove electron? What will be work function of metal Also find threshold wavelength? ​

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Answer 1

Minimum frequenty required to remove electron from Cs metal is 4.6 x 10^14 Hz then what will be minimum energy of Photon use to remove electron? What will be work function of metal Also find threshold wavelength?

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Answer 2

Energy of incident radiation is E=

λ

hc

=

3×10

−7

6.6×10

−34

×3×10

8

=6.6×10

−19

J.

Also, work function is ϕ=2×1.6×10

−19

J=3.2×10

−19

J.

Hence, maximum kinetic energy of emitted photo electrons will be 6.6×10

−19

J−3.2×10

−19

J=3.4×10

−19

J

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